Abstract: The method and device for the manufacture of helical rotor blanks for helical gear machines by moving a straight cylindrical shaft in a direction along the shaft axis while rotating it around the shaft axis by means of passing the shaft between at least three bending rollers, and the opposite end of the shaft held by a rotatable clamping chuck geared for infinitely variable timed relative movement with a bending roller. A first bending roller has a ring groove with a circular arc profile and a second bending roller ring groove has an elliptical profile with the second ring groove either laterally displaced or of greater width than the ring groove in the first bending roller.

Abstract: The sensitivity of a gage using a nuclear source for measuring the water content of bulk materials, such as plastic concrete, is increased by use of a lithium or fluorine neutron nuclear source.